With the recent fourth industrial revolution, new technologies have been applied to each field, and major changes are taking place. Such technological advances have also been applied to the real estate industry, and the proptech sector is emerging. In addition, the demand for various real estate products is soaring as people’s interest increases because of the continuous price hikes in the real estate market. Therefore, people have become more interested in the platform to obtain information on real estate, from lending to the financial sector. Moreover, the real estate market has become more active and the domestic proptech market as also grown. The Big Value Company is a start-up company in the fourth industrial revolution that commercializes fintech and proptech by converging them. This company has developed an automatic real estate valuation solution and attracted customers through its platform to solve the problem, considering the limited information on the real estate market because of lack of collateral standard prices. Therefore, this case study examines the definition and type of proptech and the real estate value evaluation system through the business model of the Big Value Company, including the company outline, business structure and major customers, success factors and future challenges. This case study will help in understanding the proptech and real estate valuation system by considering the business model for a start-up company in the protech field. The study also further contributes to the improvement of the competence of real estate industry-related workers and appraisers in the future. In addition, the study will aid in improving the appraisal system efficiently and systematically by suggesting the direction in which the value evaluation system of proptech should move forward.